BARNSTABLE — Robert Upton sat silently during his murder trial Tuesday, watching himself on a television screen.

Upton, 48, of Newton is accused — along with his nephew Christopher Manoloules, 21 — of shooting and killing Aris Manoloules on Sept. 29, 2009, in a botched robbery attempt in Hyannis.

Upton isn't scheduled to testify in the trial, so the videotape — the recording of his October 2009 interview with Newton police and Massachusetts State Police — is the only chance jurors will have to hear from him.

During the course of the nearly four-hour interview, state police Trooper Richard Cosgrove, who also testified Monday and Tuesday, asked Upton repeatedly about the Ruger handgun he told police he purchased just before the murder.

On Monday, a state police ballistics expert connected the handgun to bullets and shell casings from Aris Manoloules' home, where he was killed.

On the video, Upton told the officers he bought the gun and put it into the trunk of his Mercedes — and that's the last he saw of it. Upton said he noticed the next day that it was missing but denied seeing Christopher Manoloules with it.

The gun turned up a few days later in the basement of Upton's ex-girlfriend, Erin O'Malley of Newton.

Initially, Upton denied on the tape that he and Christopher Manoloules drove to Cape Cod the night of Sept. 29. Then, about 90 minutes into the tape, he said they did drive to the Cape.

He told the officers he and Christopher Manoloules went to a house in Hyannis so Christopher could "see somebody." Christopher Manoloules testified last week the pair stopped at Aris Manoloules' house at 25 Ripple Cove Road in Hyannis.

When he came back to the car about 20 minutes later, Christopher Manoloules was "tensed up," Upton said on the tape.

Upton was insistent that he never entered the house and appeared incredulous when Cosgrove suggested it.

"I've never robbed anybody. I've never shot anybody," Upton said adamantly on the tape.

In March, Upton moved to make the video inadmissible, telling Barnstable Superior Court Judge Robert Rufo that Upton was under the influence of drugs and alcohol. Rufo ruled the entire video admissible.

But on Tuesday, Judge Gary Nickerson ruled that the last section of the interview would be redacted based on an August decision by the state Supreme Judicial Court regarding taped police interviews.